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Ensure replacing a template part using a pattern doesn't update the existing entity #44221

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merged 1 commit into from
Sep 19, 2022

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talldan
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@talldan talldan commented Sep 16, 2022

What?

Fixes the comment here - #41397 (comment), see also #44147

Why?

As mentioned in the above issue comment, it can be confusing that selecting a template part creates a new entity, while selecting a pattern replaces the blocks in the existing entity.

This can also be destructive if the user didn't intend to update the entity. A template part can be used across multiple templates, so it would result in unexpectedly widespread changes.

How?

Remarkably the fix is to delete some code. There was a specific code path added to replace the template part's blocks, but I removed this in favour of the same behavior the template part's placeholder has - creating a new entity and setting that entity as active.

Testing Instructions

  1. Open a template in the site editor
  2. Select a template part (preferably a header or footer) and make a note of the name of the template part.
  3. Select 'Replace' from the block settings drop down
  4. Select a pattern (that has a different name to the current template part).
  5. Observe that a new template part is created that has the same name as the pattern
  6. Click the editor 'Save' button.
  7. Observe that the only 'edits' are to the Template.

Screenshots or screencast

Before

Kapture.2022-09-16.at.16.23.41.mp4

After

Kapture.2022-09-16.at.16.21.07.mp4

@talldan talldan added [Type] Bug An existing feature does not function as intended Backport to WP 6.7 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta [Block] Template Part Affects the Template Parts Block labels Sep 16, 2022
@talldan talldan self-assigned this Sep 16, 2022
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Size Change: -28 B (0%)

Total Size: 1.26 MB

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This tested well for me. I see that replacing the template blocks when selecting a pattern was a deliberate design decision initially (here and here), but as you note it seems like this approach makes more sense, because the current approach could result in the inadvertent overwriting of template content in templates that are used in multiple places.

@talldan talldan merged commit 7974e05 into trunk Sep 19, 2022
@talldan talldan deleted the fix/template-part-replace-removing-existing-blocks branch September 19, 2022 04:08
@github-actions github-actions bot added this to the Gutenberg 14.2 milestone Sep 19, 2022
ockham pushed a commit that referenced this pull request Sep 19, 2022
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ockham commented Sep 19, 2022

I just cherry-picked this PR to the wp/6.1 branch to get it included in the next release: 69597b9

@ockham ockham removed the Backport to WP 6.7 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta label Sep 19, 2022
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